Metallic bedstead.



E. L. ROSENBURGH.

METALLIC BE'DSTEAD.

'APPLICATION FILED 1uLY12. 191'3.

1,170,850, Peeeneed Fe1e.8,l1916.v

UNITED sTATEs .PATENT oEEIcE..

ERNEST L. ROSENBURGH, OF ROME, NEW YORK, ASSIGNOR T0 ROME METALLIC BED- STEAD COMPANY, F ROME, NEW YORK, A CORPORATION OF NEW YORK.

l METALLIC BEDSTEAD.

Application led July 12, 1913.

T0 all lwhom t may concern:

' Be it known that I, ERNESTv L. ROSEN- BURGH, a citizen of the United States, residing at Rome, county of Oneida, State of New York, have invented certain new and useful Improvements in Metallic Bedsteads, the following being a full, clear, and exact disclosure of theone form of my invention which I at present deem preferable.

.0 For a detailed description of the present I member of a -bedstead composed of a continuous length of metal tubing bent at the corners and having a double wall, to-wit, an inner wall of steel (or iron) and an outer Wall of brass, the steel wall being formed of a stri bent into tubular form preferably with ree abutting edges, and the brass wall being similarly formed but having its edges secured, preferably by an interlocking fold or seam contained in a shallow groove or depression in the steel tube, so that the brass wall may have a continuous circular contour unbroken by a ridge at the folded seam; such double-walled tubing I will refer to hereinafter as compound sea-med tubing. In orderthat a compound tube of this description may be bent into aninety degree curve to bring the vertical side-post portions at right angles to the horizontal top-rail portion of the continuous framemember, I locate the seam of the brass tube .0 at a point outside of the longitudinal di- 'ameter of the tube and the seam of the steel tube I locate at a point out of the said longitudinal diameter, preferably inside thereof. By the expression longitudinal di- L5 ameter I refer to a diameter from the front Specication f Letters Patent.

' of. steel, or of Patented Een. s, 1916,

serial No. 778,789.

cident to the bending will not cause the edges to fall out of line with each other between the two `jaws of the bending die. In other words the meeting line of the two parts 4of the die will come opposite an unbroken portion of the doublewall. I prefer to locate the seam'of the steel within the said diameter because it is thus removed as far as possible.(z'. e. 180 degrees) from the seam of the brass tube. Moreover by continuing the compound tube longitudinally from each end of the curve to form the top rail on the one hand and the side-post on the other hand, I am enabled to hold the brass-on the curve against bulging and splitting at the seam, such as would occur if the tube were cut off at or near one end of the curved portion. That is to say, it requires a long tangential portion on each sideof the curve to keep the brass from springing away from the steel by reason of the stress in the brass on the curve.

Referring to the accompanying drawing A represents the vend-frame member of luy .present invention, it being the fundamental member forming the rim of t-he end-frame to Whlch sultable transverse members D and longitudinal members E may be secured.

l straight or less curved portion for the purpose of retaining in place the external brass tube which would tend to bulge away from the internal steel tube `on the curve but for the rest-raining effect of the long tangential portion, particularly at the time of the bending operation. This compound tube is of the seam type, the inner tube, which is of thicker material than the outer one, being iron, and the outer one of brass.

In Fig. 2 the outer tube is shown in' cross section at a1 and theI inner one at n2. The latter has its edges meeting` but not welded together, at b2 to produce the seam. while the former has its seam 1S() degrees from IF at b1 where its edges are intel-folded or interlocked as shown and the overlap is seated in a slight groove or depression b3 in the steel tube whereby 'the brass tube may retain a continuous circular contour unbroken by a ridge at the fold. The horizontal diameter of the compound tube in a direc tion longitudinal of the bed is indicated by the line f-f and it will be observed that the seam b1 lies above or outside of this diameter while the seam b2 lies beneath or within it. By this means the bending of the compound tube brings a lstretching strain on the seam which tends to draw it in tightly against the inner tube, thereby preventing buckling and bulging of the 'outer tube along the seam. On the other hand the seam b2 does not lie in the diameter where it would cornen opposite the meeting edges of theY Bending dies and where the .pressure of the dies would tendfto force one edge of the seam inward or outward with respect to the other edge and thereby cut the brass of the outer tube, but it lies out of that diametrical line and preferably within it, while the seam b1 lies without it, so that the two seams will come as fair apart from each other around the tube as. possible. A is therefore one which can be produced cheaply with practically no percentage of loss in manufacturing while it also has-a strength and stiffness much greater than members of similar shape formed of several sections joined together. It is also stronger The tubular member 4 amount of that expensive metal, and yet be solidly supported by thc underlying steel.

Vhat I claim as new and desire to secure by Letters Patent is:

l. A bedstead-frame member formed of a continuous length of bent compound seamed tubing. v

2. A bedstead-frame member formed of a continuous -length of bent compound seamed ltubing, the seam of the external tube being outside of and the seam of the internal tube being inside of the longitudinal diameter of the tubing.

6. An end-frame member of a bedstead having both its sideepost portions and its toperail portion formed of a continuous length of-bent compound seamed tubing.

In witness whereof vl have hereunto set my. hand before two subscribing witnesses, 

